[DWARF] NFC: DWARFDataExtractor combines relocs with DataExtractor.

Requires callers to directly associate relocations with a DataExtractor
used to read data from a DWARF section, which helps a callee not make
assumptions about which section it is reading.
This is the next step in reducing DWARFFormValue's dependence on DWARFUnit.

Differential Revision: https://reviews.llvm.org/D34704

llvm-svn: 306699
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
index b4b682d..ef416f7 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
@@ -308,7 +308,7 @@
                     DIDumpOptions DumpOpts) const {
   if (!isValid())
     return;
-  DataExtractor debug_info_data = U->getDebugInfoExtractor();
+  DWARFDataExtractor debug_info_data = U->getDebugInfoExtractor();
   const uint32_t Offset = getOffset();
   uint32_t offset = Offset;